CompatHelper: bump compat for Functors to 0.5, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Functors package from 0.4 to 0.4, 0.5.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[CarloLucibello]

the upgrade is blocked by MLDataDevices

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.58%. Comparing base (7525499) to head (6ee1082).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2516   +/-   ##
=======================================
  Coverage   34.58%   34.58%           
=======================================
  Files          31       31           
  Lines        1897     1897           
=======================================
  Hits          656      656           
  Misses       1241     1241           

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